#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
const int mod = 1e9 + 7;

int gcd(int a, int b)
{
    return b ? gcd(b, a % b) : a;
}

ll qmi(ll a, ll b)
{
    ll res = 1;
    while(b)
    {
        if(b & 1)res = res * a % mod;
        b >>= 1;
        a = a * a % mod;
    }
    return res;
}
struct custom_hash {
	static uint64_t splitmix64(uint64_t x) {
		x ^= x << 13;
		x ^= x >> 7;
		x ^= x << 17;
		return x; 
	}
	size_t operator () (uint64_t x) const {
		static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count(); // 时间戳
		return splitmix64(x + FIXED_RANDOM);
	}
};


int main()
{
    int n, m;
    cin >> n >> m;
    vector<int> h(n + 1);
    for(int i = 1; i <= n; i++) cin >> h[i];
    map<int, int> mp;
    while(m--)
    {
        int a, b;
        cin >> a >> b;
        if(h[b] > mp[a]) mp[a] = h[b];
        if(h[a] > mp[b]) mp[b] = h[a];
    }
    int ans = 0;
    for(int i = 1; i <= n; i++)
    {
        if(h[i] > mp[i])
            ans++;
    }
    cout << ans << endl;
    return 0;
}